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中国化学会第八届全国配位化学会议

作者： Tingjiao Yuan Zhe Liu Jianshe Zhao Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education Northwest University

A series of cationic gemini surfactants with different hydrophobic tails were *** surfactants were characterized by elemental analysis,infrared spectrum and ESI-Mass *** to the requirements of surfactants used in enhanced oil recovery technology,physico-chemical properties including surface tension,critical micelle concentration（CMC）,contact angle,oil-water interfacial tension,compatibility with formation water were fully *** the The salt tolerance,adsorbability,flooding experiment of cationic gemini surfactant BA-14 were also *** the condition of 50℃ and 0.1%concentration,BA-14 solution could keep transparent with 80 g/L *** T of BA-14 was 6.3～11.5 mg/*** surfactant BA-14 could improve the oil displacement efficiency by 11.09%.

关键词： enhanced oil recovery cationic gemini surfactant surface tension oil/water interfacial tension

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Phase Separation and Microstructure of Mixed surfactants Solution Containing cationic geminis and Traditional Anionic surfactant

引用

Chinese Journal of Chemical Engineering 2004年第4期12卷 486-492页

作者：尚亚卓刘洪来胡英 Department of Chemistry State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China Department of Chemistry State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 Chinahe properties of aqueous two-phase system (ATPS) of mixed solution containing gemini cationic surfactant trimethylene-13-bis(dodecyldimethyl ammonium) bromide (12-3-12 2Br-) and traditional anionic surfactant sodium dodecyl sulfate (SDS) with or without added salt have been studied. An ATPS is formed in a narrow region of the ternary phase diagram different from that of traditional aqueous cationic-anionic surfactant systems. In ATPS region the lowest total concentration of surfactants varies with the mixing ratio of geminis to SDS. Photographs obtained from freeze-etching negative-staining and transmission electron microscopy show that the microstructures of two phases are different from each other. Micelles and vesicles can coexist in a single phase. The addition of salts can change the phase diagram of ATPS. Furthermore the added salts promote the aggregation of rod-like micelles to form coarse network structure that increase the viscosity of solutions. The negative ions of the added salts are the determining factor.

The properties of aqueous two-phase system (ATPS) of mixed solution containing gemini cationic surfactant trimethylene-1,3-bis(dodecyldimethyl ammonium) bromide (12-3-12, 2Br-) and traditional anionic surfactant sodium dodecyl sulfate (SDS) with or without added salt have been studied. An ATPS is formed in a narrow region of the ternary phase diagram different from that of traditional aqueous cationic-anionic surfactant systems. In ATPS region, the lowest total concentration of surfactants varies with the mixing ratio of geminis to SDS. Photographs obtained from freeze-etching, negative-staining and transmission electron microscopy show that the microstructures of two phases are different from each other. Micelles and vesicles can coexist in a single phase. The addition of salts can change the phase diagram of ATPS. Furthermore, the added salts promote the aggregation of rod-like micelles to form coarse network structure that increase the viscosity of solutions. The negative ions of the added salts are the determining factor.

关键词： cationic gemini surfactant anionic surfactant aqueous two-phase system microstructure

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